Sectional furnace casing



G. HARMs -ET' Al.

SECTIONAL FURNACE GASING 2 lSheets-Sheet l Original Filed May 16. 1921 G. HARMS ET AL.

gECTIoNAL FURNACE'CASING Original Filed May 16. 1921 2 Sheets-Sheet 2 Patented ct. 7, 1924i..k

GEORGE HAR/MS AND ROY C. WALKER, 0F PEORIA, ILLINOIS.

SECTIONAL FURNACE CASING.

Original application led May 16, 1921, Serial No. 469,897. Divided and this application filed April `28, 1922. .Serial No. 557,061.

To all 'whom it may concern:

Be it known that Gnoncn HAnMs and ROY C. WALKER, citizens of the United States of America, residing at Peoria, 'in the county of Peoria and State of Illinois, have invented certain new anduseful Improvements in Sectional Furnace Casings, of which'the following is a specification.'

Our invention relates vto improvements in furnaces.

The invention has special reference to a furnace section adapted to be associated in assembled relation to form in conjunction with connected parts of a heater unit, a housing for the latter and for forming air circulating ways and an insulating chamber.

The invention includes detailed formation and manner of relating sheet metal plates to form unit closure and circulating sections; the manner of joining the same without the use of rivets, bolts and the like and relative formation of sections to promote association or assemblage in carrying out the plan of housing or enclosing a heat unit.

Referring to the drawings, Figure l, is a front elevation of a unit section.

Figure 2, is a perspective view of a unit section.

Figure 3, is a section on the line X-X of Figure 1.

Figure 4:, is a broken sectional view in perspective showing the manner of relating a unit section to a heat unit and to associated or continuation flue cushioning space members.

Figure 5, shows a side view of a section with a part broken away, also, the manner of relating it to head or top closure `member showing in section also the manner Vof relating the section to a base member and showing clamping bands for holding the assembled section together and in relationship with associated members of the complete casing.v

Figure 6, is a detailed view showing the upper end' portions of two joined sections indicating the manner of relating or oining the same and also, shows in detail the man` ner of co-relating or inter-locking sheet metal parts in the process of forming the sections.

Figure 7 is a perspective of the furnace showing the related sections in their operative position and;

'Figure 8 is a perspective showing in broken sections the relative positioning of the adjacent sections.

In Fig. et of the drawings A indicates a portion of a furnace unit that may be of any type or style desired.

10 is an outer cap or closure section. j 11 is a similar cap or closure sectiomspaced from the outer section 10 to form a down draft space. 12 is an inner cap or casing, adapted to be spaced from casing section .11 to form an auxiliary down draft space. The section 10 is formed indepei'iden'tly and adapted for connection and register, as hereinafter noted, with assembled members of the housing sections. vThis closure section is also adapted to communicate with a register R as is the common practice in connection with pipeless furnaces. The sections l1 and 12, however, are formed asa single unit and, due to their particular form, may be attached to the assembled members of the housing sections, to be described,.,by merely being placed there over. The above result is accomplished by having the inner closure section 11, which connects with the register, having its lower end 11A angled to abut orrather seat upon the upper side of the assembled sections.V The imier section 1Q), which forms with the section 11.` an auxiliary down draft space, does not eX- tend entirely to the register and is attached at its lower end to the angled portion ofv section 11 by means of some 'formal sheet metal connection as at 12A. in fashioning section l1 its lower edge is inturned as at 11A, whereby in seating in connection with unit wall sections said inturned portion overlies the top of the outer portion of ksaid unit sections, however, as a draft course is to be established through the space between sections 11 and l2 and a spaced portion within the unit sections, we have slottedv the inturned portion 11A as at 11B, thereby form# ing a continuous draft course through the space between the cap or closure sections mentioned. 13 is a base member adapted to be located upon the furnace foundation or floor and is adapted to support the assembled unit housing sections. 1

Referring particularly to the unit sections to which this invention is specially directed, 11i and 15 are respectively sheet metal plates forming the outer and inner walls ofthe unit sections. point of union by seating 'upon basemem- Said wall 14 extending to a ber l The inner wall 15 extends from a common plane at its upper end with outer section 14 to a point short of the lower end of section 14 to provide a circulating space between its lower edge and the floor line or support for the complete furnace. 16 is an intermediate partitioning wall spaced from wall 14 a considerable distance to form a down draft passage way and also, spaced a comparatively short distance from wall 15 to form a space to prevent excessive heating of wall 16 to the end of protecting the down draft space between the sections 14 and 16 against a degree ofheat that would interfere with proper air circulation within the down dra-ft space. 1T is a side wall member of the unit section, the same being spaced at its upper end slightly below the upper edges the sheet metal sections 14, 15 and 16 and extending downwardly to a point below the lower edge of outer section 14 and in substantial conta-ct with the ioor and is provided with the outwardly and upwardly turned interlocking member 18 to provide for the seating of the lower edge of the side wall of an abutting section when the unit closure sections are assembled. 19 is an opposite side wall of the unit section, the same being similarly disposed with its upper edge below the upper edges of sections 14,15 and 16 and on a line with the upper edge of end portion 17 and extending downwardly to a point substantially in contact with the floor line of the furnace support. Both side sections 17 and 19 are cut away as at 2O to provide a clearance space to facilitate seating of the unit section in conjunction with base ring 13. Side wall 17 is fashioned at its upper edge with an outwardly and downwardly turned member 21 adapted to engage an abutting rsection in disposing' the unit sections in assembled relation.

Referring now to detailed matters respecting the method of joining the sheet metal parts that go to make up the complete unit section, wall 14 is lfashioned at its side portions with an inturned member 21A and an out-turned member said members being spaced relatively substantially the thickness of the metal section. r1`he side wall section 19 is fashioned at its outward end for placement alining with its outer face on aline with the outer edge of the inturned member 21A of section 14 but is inturned as at 23 and forwardly ext-ended as at 24 and then inturned as at 25 and relatively spaced as to said forwardly extending and inturned members substantially the thickness of the metal body and adapted to over-lie outwardly extending member 22 of section 14, whereby members respectively of the two members 21A, 22, 24 and 25 are disposed in abutting relation and thereafter the joined parts are indented on the line as rit-A at intervals throughout the length of the seam formed by the joined parts, whereby a perfect union is established between sections 14 and 19 without the requirement of bolts and rivets. Vllhe inner end of side wall member 19 is fashioned with the portion 26 eX- tendino' on a line with the inter-circumferential race of section 15 and the returned memberv 27 spaced therefrom substantially double the thickness of the body thereof and sections 15 and 16 are inter-connected there with section 15 by a fashioning of its edge portion to provide the inset portion 28 and the returned portion 29 related respectively in a manner to form a hook with relative spacing to accommodate seating over member 27 of side member 19. Section 16 is fashioned with the inturned member 30 disposed `for abutment with the inner wall of end section 19 and to provide relative spacing between sections 15 and 16 and is inturned as at 31 for seating in conjunction with inturned member 29 of section 15 to jointly occupy the space between members 27 and 26 of sections 19, whereby an interlocked joint or seam is vformed to effect a joining of sections 15 and 16 and 19 of the unit section. rlhe members of the respective sections, having tion with an abutting unit section. Also, in

this figure is shown in an abutting section, the identical construction of the joining means of the opposed end of the section previously indicated. In this opposed section 32 is an outer shell or sheet metal section corresponding to unit section member 14 and is fashioned similar to the corresponding end of unit section member 14 herein seam member 33 is deiiected from the circumferential line of section 32 and extended forwardly to over-lie the end of an adjoining` unit section and is provided with return member 34 spaced from member 33 substantially the thickness of the metal body of said member. 85 is the same as the corresponding opposite wall to wall 19 and is fashioned at its outer end with the angularly disposed member 36 adapted to vbe seated in the space between members 33 and 84 of metal section 32. The joining seam, thus fashioned, comprising members 33, 34 and 36 when so related, are indented at intervals of the length of the seam on the line C-C for interlocking purposes.

ln Figures T and 8 of the drawings, the exterior of the furnace is shown in perspective wherein a plurality of sections each section formed of concentrically spaced sheet metal wall members inwardly tapering, are arranged together in a manner to be supported by the inner engaging marginal folds which makes possible the positive support* ing of the various sections without the use of bolts, rivets or the like.

In practice unit sections are adapted to be assembled in connection with a front wall closure unit associated with fire pot and ash p-it entry ways as shown in our application Serial No. 517,470 filed November 25, 1921. 38 are metal bands adapted to embrace the assembled unit sections and to be connected in a suitable manner with the front closure wall just above mentioned, whereby, the associated housing units for the enclosed heater may be firmly secured together.

l/Vhat we claim is:

1. A furnace casing comprising a plurality of sections, each section formed of concentrically arranged spaced sheet metal wall members inwardly tapering, and side closure members joining the wall members, said side closure members being provided with interengaging marginal folds adapted to support adjacent sections without the use of bolts, rivets or the like.

2. In a device of the class described, in combination, three arcuately fashioned sheet metal sections of graduated dimensioning width respectively, from the outer to the inner section, the intermediate section being provided with an olf-set portion towards the inner section to provide for support and relative spacing in conjunction with said inner section, the marginal edges of each of said sections being relatively fashioned with spaced folds, and side wall members, their marginal edges being similarly fashioned with spaced folds, whereby, rela-tive interlock may be established between the several sections and co-incident indentations progressively throughout the length of the several folds whereby, said sections are secured together into a complete unit without the use of bolts, rivets and the like.

3. In a device of the class described, in combination, a plurality of arcuately shaped sheet metal sections, concentrically arranged in spaced relation and of graduated diminished width respectivelyfrom the outer to the inner section, and side closure members associated with said sections `and each of said .sections and the side `closure members being relatively fashioned at their marginal edges with co-incident spaced folds to provide for interlock therebetween, said folds being co-incidently indented to secure said sections together, whereby, a unit section is formed without the use of bolts., rivets and the like. i

4. In a device of the class described, in combination, a plurality of arcuately shaped sheet metal sections, concentrically arranged in spaced relation and of graduated diminishedwidth respectively from the outer to the inner section, and side closure membersassociated with said sections, fashioned respectively at opposed end portions with a hook member, and each of said sections and the side closure members being relatively fashioned at their lateral marginal edges with co-incident spaced folds to provide for interlock therebetween, said foldsvbeing coincidently indented to secure said sections together, whereby, a unit section is formed without the use o-f bolts, rivets and the like.

5. In a device of the class described, in combination, arcuately fashioned sheet metal sections, including an outer, inner, and intermediate section arranged relatively in spaced relation, the outer and inner sections having marginal edges inturned in spaced relation to kform a fold, the intermediate section fashionedto off-set towards the inner section toV establish relative spacing therebetween and provided with a folded relatively spaced marginal portion for inter-folded engagement with the marginal edge of said inner section, and side wall members, fashioned at their lateralv edges with inturned relatively` spaced, folded portion, adap-ted to engage respectively with the folded portions of the outer and inner sections, and whereby relative interlock may be estab-lished between the several sections and co-incident intervaled indentations in said folded members for securing them together.

In testimony whereof they aiiiX their signatures.

eEoReE HARMs. RoY c. WALKER, 

